Getting 401 Errors with PUT But Getting 200 with GET

[BarryDuggan]

So I'm making requests to a server that requires an Authorisation header.

I can successfully call the GET endpoints setting the auth header.

GET REQUEST

client.beginRequest();
  client.get("/api/v1/myGetRequest");
  client.sendHeader("Authorization", "Basic abc123");
  client.endRequest();
  int statusCode = client.responseStatusCode();
  String response = client.responseBody();
  Serial.print("GET Status code: ");
  Serial.println(statusCode);
  Serial.print("GET Response: ");
  Serial.println(response);

When I attempt a PUT request however I get a 401 status

PUT REQUEST

void postStatus() {
 String postData;
  Serial.println("making POST request");
  if (alarmIsOn == true) {
    postData = "{\"status\":\"alarmOn\"}";
  } else {
    postData = "{\"status\":\"alarmOff\"}";
  }
  String contentType = "application/json";
  client.beginRequest();
  client.put("/api/v1/myPutRequest", contentType, postData);  
  client.sendHeader(HTTP_HEADER_CONTENT_LENGTH, postData.length());
  client.sendHeader("Authorization", "Basic abc123");
  client.sendHeader("accept", "application/json"); 
  
  client.endRequest();
  client.print(postData);
  

  // read the status code and body of the response
  int statusCode = client.responseStatusCode();
  String response = client.responseBody();

  Serial.print("Status code: ");
  Serial.println(statusCode);
  Serial.print("Response: ");
  Serial.println(response);

}

I've verified that the auth token is correct using postman.
Could somebody help me figure out why setting the auth header for GET works fine but doesnt work for PUT?

[BarryDuggan]

For anybody else that comes lands here from google, the correct way to write the PUT request is

 putClient.beginRequest();
   putClient.put(endpoint);
   putClient.sendHeader("Content-Type", "application/json");
  putClient.sendHeader("Authorization", "Basic abc");
  putClient.sendHeader("Content-Length", String(jsonString.length()));
  putClient.beginBody();
  putClient.print(jsonString);
   putClient.endRequest();